Snap action thread and gimp trimming on a buttonhole machine
Patent 5447108 Issued on September 5, 1995. Estimated Expiration Date: 
September 29, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 29, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorsAssigneeApplicationNo. 128122 filed on 09/29/1993US Classes:112/66, Eyelet making83/586, Stored energy furnishes cutting force112/253, Thread end clamps112/298Single blade cutterExaminersPrimary: Crowder, Clifford D.Assistant: Izaguirre, Ismael Attorney, Agent or FirmForeign Patent References
International ClassesD05B 003/08D05B 065/00 B26D 001/08 AbstractThe invention relates to thread trimming devices for eyelet buttonhole machines. The invention comprises a thread trimming device having a snap action spring arm knife. As the thread hook positions the thread and gimp, a cam lifts up the end of the spring arm. The cam then releases the knife whose torque snaps down and cuts the thread and gimp against a second knife edge. The thread and gimp are also held together at this point for the next buttonhole by a thread retainer which is built into the knife. | |
